3 files changed, 4 insertions, 4 deletions
diff --git a/contrib/tools/chkfmt b/contrib/tools/chkfmt
index a1b88ccbf..95181fde2 100755
--- a/contrib/tools/chkfmt
+++ b/contrib/tools/chkfmt
@@ -54,7 +54,7 @@ doed(){
 }
 
 # In beta versions the version string which appears in files can be a little
-# long and cause spuriously overlong lines.  To avoid this subtitute the version
+# long and cause spuriously overlong lines.  To avoid this substitute the version
 # string with a 'standard' version a.b.cc before checking for long lines.
 if test -r png.h
 then
diff --git a/contrib/tools/pngcp.c b/contrib/tools/pngcp.c
index 5f304e30f..2f6ea65d2 100644
--- a/contrib/tools/pngcp.c
+++ b/contrib/tools/pngcp.c
@@ -191,7 +191,7 @@ vl_strategy[] =
    /* This controls the order of search. */
    { "huffman", Z_HUFFMAN_ONLY },
    { "RLE", Z_RLE },
-   { "fixed", Z_FIXED }, /* the remainder do window searchs */
+   { "fixed", Z_FIXED }, /* the remainder do window searches */
    { "filtered", Z_FILTERED },
    { "default", Z_DEFAULT_STRATEGY },
    { all, 0 }
@@ -336,7 +336,7 @@ static const option options[] =
 #  define VLC(name) VLCIDAT(name) VLCiCCP(name) VLCzTXt(name)
 
 #  ifdef PNG_SW_COMPRESS_png_level
-      /* The libpng compression level isn't searched beause it justs sets the
+      /* The libpng compression level isn't searched because it justs sets the
        * other things that are searched!
        */
       VLO("compression", compression, 0)
diff --git a/contrib/tools/pngfix.c b/contrib/tools/pngfix.c
index e6403dc48..f494230d8 100644
--- a/contrib/tools/pngfix.c
+++ b/contrib/tools/pngfix.c
@@ -2363,7 +2363,7 @@ zlib_advance(struct zlib *zlib, png_uint_32 nbytes)
       flush = Z_NO_FLUSH;
       out_bytes = 0;
 
-      /* NOTE: expression 3 is only evaluted on 'continue', because of the
+      /* NOTE: expression 3 is only evaluated on 'continue', because of the
        * 'break' at the end of this loop below.
        */
       for (;endrc == ZLIB_OK;