diff --git a/nw/constants/constants.py b/nw/constants/constants.py
index 7c25fa46..e810dabf 100644
--- a/nw/constants/constants.py
+++ b/nw/constants/constants.py
@@ -233,6 +233,8 @@ class nwUnicode:
     U_ENDASH = "\u2013" # Short dash
     U_EMDASH = "\u2014" # Long dash
     U_HELLIP = "\u2026" # Ellipsis
+    U_MAPOSS = "\u02bc" # Modifier letter single apostrophe
+    U_MAPOSD = "\u02ee" # Modifier letter double apostrophe
 
     ## Spaces and Lines
     U_NBSP   = "\u00a0" # Non-breaking space
@@ -283,6 +285,8 @@ class nwUnicode:
     H_ENDASH = "–"
     H_EMDASH = "—"
     H_HELLIP = "…"
+    H_MAPOSS = "ʼ"
+    H_MAPOSD = "ˮ"
 
     ## Spaces
     H_NBSP   = " "
diff --git a/nw/constants/enum.py b/nw/constants/enum.py
index 49d76f5e..81200a63 100644
--- a/nw/constants/enum.py
+++ b/nw/constants/enum.py
@@ -112,6 +112,8 @@ class nwDocInsert(Enum):
     QUOTE_RS      = 9
     QUOTE_LD      = 10
     QUOTE_RD      = 11
+    MODAPOS_S     = 12
+    MODAPOS_D     = 13
 
 # END Enum nwDocInsert