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-rw-r--r--lib/ppm.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/ppm.h b/lib/ppm.h
index b4350e1d..622d3e09 100644
--- a/lib/ppm.h
+++ b/lib/ppm.h
@@ -259,7 +259,10 @@ ppm_saturation(pixel const p,
 
 typedef enum {
     /* A color from the set of universally understood colors developed
-       by Brent Berlin and Paul Kay
+       by Brent Berlin and Paul Kay.
+
+       Algorithms in libnetpbm depend on the numerical representations
+       of these values being as follows.
     */
     BKCOLOR_GRAY = 0,
     BKCOLOR_BROWN,