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diff --git a/src/SUMMARY.md b/src/SUMMARY.md
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+++ b/src/SUMMARY.md
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 # Summary
 
-- [Phonology](./phonology.md)
-- [Syntax](./syntax.md)
-- [Lexicon](./lexicon.md)
+- [Introduction](./introduction.md)
+- [Phonology](./grammar/phonology.md)
+- [Syntax](./grammar/syntax.md)
+- [Lexicon](./lexicon/index.md)
diff --git a/src/grammar/phonology.md b/src/grammar/phonology.md
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+# Phonology
+
+Isanercent shares the same set of phonemes of German. Below is a description
+based on Wikipedia article.
+
+## Consonants
+
+|  | labial | alveolar | post-alveolar | palatal | velar/uvular | glottal |
+|--|--------|----------|---------------|---------|--------------|---------|
+| nasal | m | n        |               |         | ŋ            |         |
+| plosive | p b | t d  |               |         | k g          |         |
+| affricate | pf | ts  |  tʃ  dʒ       |         |              |         |
+| fricative | f v | s z | ʃ ʒ          | ç j     | x            | h       |
+| liquid |     | l     |               |         |              |         |
+
+## Vowels
+
+|  | front (u)       | front (r)     | central | back |
+|--|-----------------|---------------|---------|------|
+| close | ɪ iː       | ʏ yː          |         | ʊ uː |
+| close-mid | eː     | øː            | (ə)     | oː   |
+| open-mid | ɛ (ɛː)  | œ             | (ɐ)     | ɔ    |
+| open |             |               | a       |      |
+
+- /ə/ is often realized as mid central unrounded [ə] and close-mid central
+  unrounded [ɘ].  It occurs only in unstressed syllables, for instance in
+  Isanercent [ˈɪzaˌnɛɐtsən].  If a sonorant follows in the syllable coda, the
+  schwa often disappears so that the sonorant becomes syllabic, for instance
+  [ˈɪzaˌnɛɐtsn̩]
+- /ɐ/ is a common allophone of the sequence /ər/
+
+## Diphthongs
+
+### Phonemic
+
+| Ending point → | front | back |
+|----------------|-------|------|
+| open-mid       | ɔʏ̯    |      |
+| open           | aɪ̯    | aʊ̯   |
+
+### Phonetic
+
+In the varieties where speakers vocalize /r/ to [ɐ] in the syllable coda, a
+diphthong ending in [ɐ̯] may be formed with every stressable vowel.
+
+## Romanization
+
+While we can directly borrow German's orthography, seeing that we can improve
+its intuitivity, it is modified a little.
+
+### Consonants
+
+- b: at end of syllable: [p]; otherwise: [b]
+- c: [ts]
+- ch: after a, o, and u: [x]; after other vowels or consonants or initially:
+  [ç] or [k].
+- ck: [k], follows short vowels
+- d: at end of syllable: [t]; otherwise: [d] or [d̥]
+- dz: [dʒ]
+- dt: [t]
+- f: [f]
+- g: when part of word-final -ig: [ç] or [k] (Southern German); at the end of a
+  syllable: [k]; otherwise: [ɡ] or [ɡ̊]
+- h: [h]
+- k: [k]
+- l: [l]
+- m: [m]
+- n: [n]
+- ng: usually: [ŋ]; in compound words where the first element ends in "n" and
+  the second element begins with "g" (-n·g-): [nɡ] or [nɡ̊]
+- nk: [ŋk]
+- p: [p]
+- pf: [pf] in all cases with some speakers
+- qu: [kv] or [kw] (in a few regions)
+- r: [ʁ] before vowels, [ɐ] otherwise; or
+- s: before and between vowels: [z] or [z̥]; before consonants or when final: [s];
+  before p or t at the beginning of a word or syllable: [ʃ]
+- sch: [ʃ]; however
+- ss: [s]
+- t: [t]
+- tsch: [tʃ]
+- ts: [ts], follows short vowels
+- tzsch: [tʃ]
+- v: [v]; word-ending: [f]
+- w: [v]
+- z: [ʒ]
+- zsch: [tʃ]
+
+### Vowels
+
+|      | front (u)    | front (r)   | central | back |
+|------|--------------|-------------|---------|------|
+| close | ɪ (ǐ) i (i) | ʏ (y) y (ü) | | ʊ (ǔ) u (u)  |
+| close-mid | e (e)   | ø (ö)       | ə (e)  | o (o) |
+| open-mid | ɛ (ä)    | œ (œ)       | ɐ (r)  | ɔ (ǒ) |
+| open |              |             | a (a)  |       |
diff --git a/src/grammar/syntax.md b/src/grammar/syntax.md
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+# Syntax
diff --git a/src/introduction.md b/src/introduction.md
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+# Introduction
+
+Isanercent is a relex based on German with only a few grammatical,
+orthographical, and phonology changes.
+
+In-world wise, Isanercent is spoken by people in Isanerc.
diff --git a/src/lexicon/index.md b/src/lexicon/index.md
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+# Lexicon