diff --git a/src/filegui.c b/src/filegui.c
index 4d36808c3..e87e056e7 100644
--- a/src/filegui.c
+++ b/src/filegui.c
@@ -714,7 +714,7 @@ file_progress_real_query_replace (FileOpContext *ctx,
 	    return FILE_CONT;
 
     case REPLACE_REGET:
-	/* Carefull: we fall through and set do_append */
+	/* Careful: we fall through and set do_append */
 	ctx->do_reget = _d_stat->st_size;
 
     case REPLACE_APPEND:
diff --git a/src/fileopctx.h b/src/fileopctx.h
index b0fdfe6dc..84222ab46 100644
--- a/src/fileopctx.h
+++ b/src/fileopctx.h
@@ -85,7 +85,7 @@ typedef struct {
 	int dive_into_subdirs;
 
 	/* When moving directories cross filesystem boundaries delete the
-	 * successfull copied files when all files below the directory and its
+	 * successfully copied files when all files below the directory and its
 	 * subdirectories were processed.
 	 *
 	 * If erase_at_end is zero files will be deleted immediately after their
diff --git a/src/global.h b/src/global.h
index d9d8219fd..bbe923c6f 100644
--- a/src/global.h
+++ b/src/global.h
@@ -6,7 +6,7 @@
 #ifndef __MC_GLOBAL_H
 #define __MC_GLOBAL_H
 
-#include <stdlib.h>	/* for free() and other usefull routins */
+#include <stdlib.h>	/* for free() and other useful routins */
 
 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H)
 #  include <string.h>
diff --git a/src/layout.c b/src/layout.c
index 6e098f98b..062147bd9 100644
--- a/src/layout.c
+++ b/src/layout.c
@@ -92,7 +92,7 @@ int output_lines = 0;
 /* Set if the command prompt is to be displayed */
 int command_prompt = 1;
 
-/* Set if the nice and usefull keybar is visible */
+/* Set if the nice and useful keybar is visible */
 int keybar_visible = 1;
 
 /* Set if the nice message (hint) bar is visible */
diff --git a/src/myslang.h b/src/myslang.h
index b5d17235b..21a68213c 100644
--- a/src/myslang.h
+++ b/src/myslang.h
@@ -130,7 +130,7 @@ mc_addch (char c)
 #ifdef HAS_ACS_AS_PCCHARS
 #   define one_vline() addch(ACS_VLINE)
 #   define one_hline() addch(ACS_HLINE)
-    /* This is fast, but unusefull if ! pc_system - doesn't use
+    /* This is fast, but only useful on PC system as it doesn't use
        Alt_Char_Pairs [] :( */
 #else
     /* This is slow, but works well :| */ 
diff --git a/src/screen.c b/src/screen.c
index 78e882f10..e0dbaf51d 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2121,7 +2121,7 @@ panel_key (WPanel *panel, int key)
     }
 
     /* We do not want to take a key press if nothing can be done with it */
-    /* The command line widget may do something more usefull */
+    /* The command line widget may do something more useful */
     if (key == KEY_LEFT)
 	return move_left (panel, key);