diff --git a/lib/resources/ui/sp-profiler-menu-button.ui b/lib/resources/ui/sp-profiler-menu-button.ui
index 4e6359fd..610183ee 100644
--- a/lib/resources/ui/sp-profiler-menu-button.ui
+++ b/lib/resources/ui/sp-profiler-menu-button.ui
@@ -55,7 +55,7 @@
             <child type="center">
               <object class="GtkLabel">
                 <property name="hexpand">true</property>
-                <property name="label" translatable="yes">Profile my _entire system</property>
+                <property name="label" translatable="yes" comments="Translators: This is the description for a switch.">Profile my _entire system</property>
                 <property name="use-underline">true</property>
                 <property name="visible">true</property>
                 <property name="xalign">1</property>
@@ -92,7 +92,7 @@
                     </style>
                     <child>
                       <object class="GtkEntry" id="process_filter_entry">
-                        <property name="placeholder-text" translatable="yes">Search</property>
+                        <property name="placeholder-text" translatable="yes" comments="Translators: This is the placeholder in a search entry.">Search</property>
                         <property name="visible">true</property>
                       </object>
                     </child>
@@ -161,7 +161,7 @@
                 <child>
                   <object class="GtkCheckButton" id="inherit_environ">
                     <property name="active">true</property>
-                    <property name="label" translatable="yes">Inherit current environment</property>
+                    <property name="label" translatable="yes" comments="Translators: This is a check button.">Inherit current environment</property>
                     <property name="visible">true</property>
                   </object>
                 </child>
diff --git a/lib/visualizers/sp-visualizer-list.c b/lib/visualizers/sp-visualizer-list.c
index f3375259..b759dc5c 100644
--- a/lib/visualizers/sp-visualizer-list.c
+++ b/lib/visualizers/sp-visualizer-list.c
@@ -272,6 +272,7 @@ handle_capture_results (GObject      *object,
   if (state->has_cpu)
     {
       GtkWidget *row = g_object_new (SP_TYPE_CPU_VISUALIZER_ROW,
+                                     /* Translators: CPU is the processor. */
                                      "title", _("CPU"),
                                      "height-request", 50,
                                      "selectable", FALSE,
@@ -286,6 +287,7 @@ handle_capture_results (GObject      *object,
     {
       GdkRGBA rgba;
       GtkWidget *row = g_object_new (SP_TYPE_LINE_VISUALIZER_ROW,
+                                     /* Translators: FPS is frames per second. */
                                      "title", _("FPS"),
                                      "height-request", 35,
                                      "selectable", FALSE,
diff --git a/lib/widgets/sp-profiler-menu-button.c b/lib/widgets/sp-profiler-menu-button.c
index 53b02c59..09ddacb2 100644
--- a/lib/widgets/sp-profiler-menu-button.c
+++ b/lib/widgets/sp-profiler-menu-button.c
@@ -134,11 +134,13 @@ sp_profiler_menu_button_update_label (SpProfilerMenuButton *self)
 
   if (n_pids == 1)
     {
+      /* Translators: %d is the PID of the process. */
       str = g_strdup_printf (_("Process %d"), pids[0]);
       gtk_label_set_label (priv->label, str);
       return;
     }
 
+  /* Translators: %u is the number (amount) of processes. */
   str = g_strdup_printf (ngettext("%u Process", "%u Processes", n_pids), n_pids);
   gtk_label_set_label (priv->label, str);
 }
diff --git a/src/resources/ui/sp-window.ui b/src/resources/ui/sp-window.ui
index 12b8dea4..6e2fc9f3 100644
--- a/src/resources/ui/sp-window.ui
+++ b/src/resources/ui/sp-window.ui
@@ -41,7 +41,7 @@
         </child>
         <child>
           <object class="GtkButton" id="record_button">
-            <property name="label" translatable="yes">_Record</property>
+            <property name="label" translatable="yes" comments="Translators: This is a button.">_Record</property>
             <property name="use-underline">true</property>
             <property name="visible">true</property>
             <property name="width-request">100</property>
@@ -115,7 +115,7 @@
                     </child>
                     <child>
                       <object class="GtkButton" id="close_info_button">
-                        <property name="label" translatable="yes">_Close</property>
+                        <property name="label" translatable="yes" comments="Translators: This is a button.">_Close</property>
                         <property name="use-underline">true</property>
                         <property name="visible">true</property>
                         <property name="width-request">100</property>
@@ -209,7 +209,7 @@
               <object class="GtkButton">
                 <property name="action-name">zoom.zoom-out</property>
                 <property name="hexpand">true</property>
-                <property name="tooltip-text" translatable="yes">Zoom out (Ctrl+-)</property>
+                <property name="tooltip-text" translatable="yes" comments="Translators: This is a tooltip.">Zoom out (Ctrl+-)</property>
                 <property name="visible">true</property>
                 <style>
                   <class name="image-button"/>
@@ -225,7 +225,7 @@
             <child>
               <object class="GtkButton">
                 <property name="action-name">zoom.zoom-one</property>
-                <property name="tooltip-text" translatable="yes">Reset zoom level (Ctrl+0)</property>
+                <property name="tooltip-text" translatable="yes" comments="Translators: This is a tooltip.">Reset zoom level (Ctrl+0)</property>
                 <property name="visible">true</property>
                 <child>
                   <object class="GtkLabel" id="zoom_one_label">
@@ -239,7 +239,7 @@
               <object class="GtkButton">
                 <property name="action-name">zoom.zoom-in</property>
                 <property name="hexpand">true</property>
-                <property name="tooltip-text" translatable="yes">Zoom in (Ctrl++)</property>
+                <property name="tooltip-text" translatable="yes" comments="Translators: This is a tooltip.">Zoom in (Ctrl++)</property>
                 <property name="visible">true</property>
                 <style>
                   <class name="image-button"/>
@@ -264,7 +264,7 @@
         <child>
           <object class="GtkModelButton">
             <property name="action-name">app.new-window</property>
-            <property name="text" translatable="yes">New Window</property>
+            <property name="text" translatable="yes" comments="Translators: This is a menu label.">New Window</property>
             <property name="visible">true</property>
           </object>
         </child>
@@ -277,14 +277,14 @@
         <child>
           <object class="GtkModelButton">
             <property name="action-name">win.open-capture</property>
-            <property name="text" translatable="yes">Open Capture…</property>
+            <property name="text" translatable="yes" context="menu label" comments="Translators: This is a menu label.">Open Capture…</property>
             <property name="visible">true</property>
           </object>
         </child>
         <child>
           <object class="GtkModelButton">
             <property name="action-name">win.save-capture</property>
-            <property name="text" translatable="yes">Save As…</property>
+            <property name="text" translatable="yes" comments="Translators: This is a menu label.">Save As…</property>
             <property name="visible">true</property>
           </object>
         </child>
@@ -297,7 +297,7 @@
         <child>
           <object class="GtkModelButton">
             <property name="action-name">win.screenshot</property>
-            <property name="text" translatable="yes">Screenshot</property>
+            <property name="text" translatable="yes" comments="Translators: This is a menu label.">Screenshot</property>
             <property name="visible">true</property>
           </object>
         </child>
@@ -310,7 +310,7 @@
         <child>
           <object class="GtkModelButton">
             <property name="action-name">win.close-capture</property>
-            <property name="text" translatable="yes">Close</property>
+            <property name="text" translatable="yes" comments="Translators: This is a menu label.">Close</property>
             <property name="visible">true</property>
           </object>
         </child>
diff --git a/src/sp-window.c b/src/sp-window.c
index 90e1da2e..beab3b76 100644
--- a/src/sp-window.c
+++ b/src/sp-window.c
@@ -146,6 +146,7 @@ sp_window_update_stats (gpointer data)
           sp_capture_writer_stat (writer, &stbuf);
 
           count = stbuf.frame_count[SP_CAPTURE_FRAME_SAMPLE];
+          /* Translators: %u is the number (amount) of samples. */
           str = g_strdup_printf (_("Samples: %u"), count);
           gtk_label_set_label (self->stat_label, str);
         }
@@ -192,6 +193,7 @@ sp_window_update_subtitle (SpWindow *self)
       dt = g_date_time_new_from_timeval_local (&tv);
       str = g_date_time_format (dt, "%x %X");
 
+      /* Translators: The first %s is a file name, the second is the date and time. */
       label = g_strdup_printf (_("%s — %s"), filename, str);
 
       gtk_label_set_label (self->subtitle, label);
@@ -303,6 +305,7 @@ sp_window_set_state (SpWindow      *self,
     {
     case SP_WINDOW_STATE_EMPTY:
     case SP_WINDOW_STATE_FAILED:
+      /* Translators: This is a button. */
       gtk_button_set_label (self->record_button, _("Record"));
       gtk_widget_set_sensitive (GTK_WIDGET (self->record_button), TRUE);
       add_class (self->record_button, "suggested-action");
@@ -323,6 +326,7 @@ sp_window_set_state (SpWindow      *self,
       break;
 
     case SP_WINDOW_STATE_RECORDING:
+      /* Translators: This is a button. */
       gtk_button_set_label (self->record_button, _("Stop"));
       gtk_widget_set_sensitive (GTK_WIDGET (self->record_button), TRUE);
       remove_class (self->record_button, "suggested-action");
@@ -347,6 +351,7 @@ sp_window_set_state (SpWindow      *self,
       break;
 
     case SP_WINDOW_STATE_BROWSING:
+      /* Translators: This is a button. */
       gtk_button_set_label (self->record_button, _("Record"));
       gtk_widget_set_sensitive (GTK_WIDGET (self->record_button), TRUE);
       add_class (self->record_button, "suggested-action");
@@ -592,10 +597,13 @@ sp_window_save_capture (GSimpleAction *action,
 
   reader = sp_capture_reader_ref (self->reader);
 
+  /* Translators: This is a window title. */
   dialog = gtk_file_chooser_native_new (_("Save Capture As…"),
                                         GTK_WINDOW (self),
                                         GTK_FILE_CHOOSER_ACTION_SAVE,
+                                        /* Translators: This is a button. */
                                         _("Save"),
+                                        /* Translators: This is a button. */
                                         _("Cancel"));
 
   gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (dialog), TRUE);
@@ -626,6 +634,7 @@ sp_window_save_capture (GSimpleAction *action,
         {
           sp_window_notify_user (self,
                                  GTK_MESSAGE_ERROR,
+                                 /* Translators: %s is the error message. */
                                  _("An error occurred while attempting to save your capture: %s"),
                                  error->message);
           goto failure;
@@ -1005,10 +1014,13 @@ sp_window_open_from_dialog (SpWindow *self)
 
   g_assert (SP_IS_WINDOW (self));
 
+  /* Translators: This is a window title. */
   dialog = gtk_file_chooser_native_new (_("Open Capture…"),
                                         GTK_WINDOW (self),
                                         GTK_FILE_CHOOSER_ACTION_OPEN,
+                                        /* Translators: This is a button. */
                                         _("Open"),
+                                        /* Translators: This is a button. */
                                         _("Cancel"));
 
   filter = gtk_file_filter_new ();
diff --git a/tools/sysprof-cli.c b/tools/sysprof-cli.c
index fab85c6e..e433dc9c 100644
--- a/tools/sysprof-cli.c
+++ b/tools/sysprof-cli.c
@@ -162,6 +162,7 @@ main (gint   argc,
       flags |= O_EXCL;
       if (g_file_test (filename, G_FILE_TEST_EXISTS))
         {
+          /* Translators: %s is a file name. */
           g_printerr (_("%s exists. Use --force to overwrite\n"), filename);
           return EXIT_FAILURE;
         }