diff --git a/prism/encoding.c b/prism/encoding.c
index 3493353b04..2c6d7c9777 100644
--- a/prism/encoding.c
+++ b/prism/encoding.c
@@ -4212,7 +4212,7 @@ pm_encoding_shift_jis_char_width(const uint8_t *b, ptrdiff_t n) {
 }
 
 /**
- * This is the table of all of the encodings that prisms supports.
+ * This is the table of all of the encodings that prism supports.
  */
 const pm_encoding_t pm_encodings[] = {
     [PM_ENCODING_UTF_8] = {
diff --git a/prism/encoding.h b/prism/encoding.h
index c286338160..8fe01aea69 100644
--- a/prism/encoding.h
+++ b/prism/encoding.h
@@ -121,7 +121,7 @@ bool pm_encoding_utf_8_isupper_char(const uint8_t *b, ptrdiff_t n);
 extern const uint8_t pm_encoding_unicode_table[256];
 
 /**
- * These are all of the encodings that prisms supports.
+ * These are all of the encodings that prism supports.
  */
 typedef enum {
     PM_ENCODING_UTF_8 = 0,
@@ -218,7 +218,7 @@ typedef enum {
 } pm_encoding_type_t;
 
 /**
- * This is the table of all of the encodings that prisms supports.
+ * This is the table of all of the encodings that prism supports.
  */
 extern const pm_encoding_t pm_encodings[PM_ENCODING_MAXIMUM];