diff --git a/Upcasing.md b/Upcasing.md
index ae08fbe..2d52c5e 100644
--- a/Upcasing.md
+++ b/Upcasing.md
@@ -6,7 +6,7 @@ When writing Greek in all uppercase letters (e.g., for titles, signs, or emphasi
 
 ## Rule 1: Remove Accents (Τόνοι)
 
-The simplest rule is that **all accents (τόνοι) are removed when a word is written in uppercase.**
+The primary rule is that **all accents (τόνοι) are removed when a word is written in uppercase.**
 
 *   Modern Greek uses a single accent mark (τόνος), which can appear on one of the last three syllables of a word.
 
@@ -15,7 +15,7 @@ Examples:
 *   `Ελλάδα` becomes `ΕΛΛΑΔΑ`
 *   `τραπέζι` becomes `ΤΡΑΠΕΖΙ`
 
-**Exception**: the disjoint preposition `ή` (a single-letter word) *keeps* the accent and becomes `Ή`.
+**Exception**: the disjoint preposition `ή` (a single-letter word) *keeps* the accent and becomes `Ή`. In this case, _and this case only_, is it acceptable to have a tonos to the left of a capital letter in all-cap setting. 
 
 ---
 
@@ -50,6 +50,7 @@ Examples:
 *   `νεράιδα` (nerá-i-da - fairy): The accent on `ά` separates it from `ι`.
     In uppercase: `ΝΕΡΑΪΔΑ`.
 
+
 Note that regular diphthongs in lowercase do **not** require adding dialytika in uppercase.
 
 Examples:
@@ -58,6 +59,16 @@ Examples:
 *   `Ευρώπη` becomes `ΕΥΡΩΠΗ` (`ΕΥ` is a diphthong)
 *   `αυτοκίνητο` becomes `ΑΥΤΟΚΙΝΗΤΟ` (`ΑΥ` is a diphthong)
 
+---
+Note that this makes round-trip case conversion significantly harder
+
+A capital Iota or Upsilon with dialytika may result from either an unaccented iota/upsilon following an accented vowel (and therefore carrying no dialytika in lowercase) or a lowercase iota/upsilon with dialytika or dialytika+tonos. 
+
+Examples:
+
+• `Μάιος` (from Rule 3 above) converts to `ΜΑΪΟΣ`, `προϋπόθεση` converts to `ΠΡΟΫΠΟΘΕΣΗ`
+• `Μαΐστρος` converts to `ΜΑΪΣΤΡΟΣ` and `προΰπαρξη` converts to `ΠΡΟΫΠΑΡΞΗ`
+
 ---
 
 ## Summary of Dialytika on Uppercase Ι/Υ
@@ -65,4 +76,4 @@ Examples:
 *   If lowercase has `αϊ, εϊ, ηϊ, οϊ, ωϊ, υϊ` or `αϋ, εϋ, ηϋ, οϋ, ωϋ`, then uppercase keeps it: `ΑΪ, ΕΪ, ΗΪ, ΟΪ, ΩΪ, ΥΪ` or `ΑΫ, ΕΫ, ΗΫ, ΟΫ, ΩΫ`.
 *   If lowercase has an accented vowel followed by `ι`/`υ` that is pronounced separately (e.g., `άι, έι, όι, άυ, έυ`), then uppercase ADDS the dialytika to the `Ι`/`Υ`: `ΑΪ, ΕΪ, ΟΪ, ΑΫ, ΕΫ`.
 
-This system ensures that the pronunciation cues present in lowercase (either through existing dialytika or the placement of accents) are not lost when words are converted to uppercase.
\ No newline at end of file
+This system ensures that the pronunciation cues present in lowercase (either through existing dialytika or the placement of accents) are not lost when words are converted to uppercase.