diff --git a/README.md b/README.md
index 6c08b8f..6fddb64 100644
--- a/README.md
+++ b/README.md
@@ -80,6 +80,7 @@ base64,            m,    rfc4648 no padding,
 base64pad,         M,    rfc4648 with padding - MIME encoding,                     candidate
 base64url,         u,    rfc4648 no padding,                                       default
 base64urlpad,      U,    rfc4648 with padding,                                     default
+proquint,          p,    PRO-QUINT https://arxiv.org/html/0901.4016,               draft
 ```
 
 **NOTE:** Multibase-prefixes are encoding agnostic. "z" is "z", not 0x7a ("z" encoded as ASCII/UTF-8). For example, in UTF-32, "z" would be `[0x7a, 0x00, 0x00, 0x00]`.
diff --git a/multibase.csv b/multibase.csv
index 3b5abe2..33f4f09 100644
--- a/multibase.csv
+++ b/multibase.csv
@@ -22,3 +22,4 @@ base64,            m,    rfc4648 no padding,
 base64pad,         M,    rfc4648 with padding - MIME encoding,                     candidate
 base64url,         u,    rfc4648 no padding,                                       default
 base64urlpad,      U,    rfc4648 with padding,                                     default
+proquint,          p,    PRO-QUINT https://arxiv.org/html/0901.4016,               draft
diff --git a/rfcs/PRO-QUINT.md b/rfcs/PRO-QUINT.md
new file mode 100644
index 0000000..5d59aa4
--- /dev/null
+++ b/rfcs/PRO-QUINT.md
@@ -0,0 +1,7 @@
+# PRO-QUINT
+
+See: https://arxiv.org/html/0901.4016 ([/ipfs/bafybeib5jsyi5igjwhi7hzkfebpvnq2ykbwpxeaaxlkyfyxqvcecoao4qa](https://dweb.link/ipfs/bafybeib5jsyi5igjwhi7hzkfebpvnq2ykbwpxeaaxlkyfyxqvcecoao4qa)).
+
+While the multibase prefix is `p`, the "full" prefix is actually `pro-`. This way, proquints are always easily pronouncable. For example
+
+`127.0.0.1`, as a multibase proquint encoded number, is `pro-lusab-babad`.